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optical and radio telecopes are build on ground but X-ray astronomy is possible only from satellites or biting the earth. Explain why?

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**Step-by-Step Solution:** 1. **Understanding the Types of Telescopes**: - Optical telescopes use visible light to observe celestial objects, while radio telescopes detect radio waves. Both types of radiation can penetrate the Earth's atmosphere effectively. 2. **Atmospheric Effects on Different Wavelengths**: - The Earth's atmosphere allows visible light and radio waves to pass through with minimal absorption or scattering. This means that optical and radio telescopes can be built on the ground without significant interference from the atmosphere. ...
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A : Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. R : Atmosphere absorbs X-rays, while visible and radiowaves can penetrate it.

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Assertion: X-ray astronomy is possible only from satellites orbiting the earth. Reasion: Efficiency of X-rays telescope is large as compared to any other telescope.

Assertion: It is possible to transmit signals from one place on the earth to practically other place on earth. Reason: A geostationary satellite orbiting the earth is u sed for transmission.

A man stands on the ground at a fixed distance from a siren which emits a clear sound dirung night that during day. Explain Why?

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